Vault door construction



c. D. GRABER 3,110,271.

' VAULT DOOR CONSTRUCTION Nov. 12, 196.3

3- Sheets-Sheet 1 Filed Feb. 20, 1962 INV EN TOR. Garb D. Grabber 9m,wwzww ATTORNEYS Nov. 12, 1963 c. D. GRABER VAULT DOOR CONSTRUCTION 3Sheets-Sheet 2 Filed Feb. 20, 1962 INVENTOR. CwrL D. Grabber 7M0, Mk4

ATTORNEYS Nov. 12, 1963 c. D. GRABYER 3,110,271

VAULT DOOR CONSTRUCTION 3 Sheets-Sheet 3 Filed Feb. 20, 1962 INVENTOR.Ca/rZ/Dfirmber BY I Fm @wvfi'dtw N ATTORNEYS United States Patent OfficePatented Nov. 12, 1%63 3,110,271 VAULT DOGR CONSTRUCTION Carl D. Graher,()rrville, Ohio, assignor to Diehold, Incorporated, Qanton, Ohio, acorporation of ()hio Filed Feb. 2%, 1962, Ser. No. 174,206 it) Claims.(Cl. 109--59) The invention relates to vau-lt door construction forvaults or vault-like structures of any kind used for storing, guardingor protecting any desired articles, objects or materials in a safe andeffective manner with maximum security; and particularly, the inventionrelates to a new concept of vault door construction utilizinginterengaging means on the door and door frame at both side edges of thedoor, but eliminating bolt-Work at the side edges of the door, therebyproviding for ease of manufacture 'while achieving maximum security.

A vault structure normally includes a vestibule extend ing through onevault wall. The outer end of the vestibule is normally closed by ahinged vault door. Authorized access to the interior of the vaultstructure is gained through the vestibule by unlocking the door andswinging the door open on its hinges. Rectangular vestibule openings anddoors are preferred since a rectangular vesibule opening achieves thegreatest flexibility With minimum obstruction in the design andcoordination of the arrangement of walls and inner and outer surfaces ofthe vault structure, of vestibule opening surfaces, and of relatedadjacent structures and surfaces.

Security for the contents of a vault, when the vault door is closed,requires the vault door, when seated and locked in the vault doorvestibule opening, to be resistant to all kinds of attack measures,external forces and conditions. Thus a closed and locked vault doorshould combine maximum resistance to mechanical cutting tools, to theintense heat of high temperature torches, to direct explosive forces, toearthquakes and to fire, heat and explosion huards at locationssufficiently near to the vault structure and of such duration as coulddamage the vault door or the contents of the vault structure unless thevault door, even though damaged by any such hazard, remains as aneffective security closure, protecting the contents of the vaultstructure against the effects or results of the indicated attackmeasures or hazards.

Certain of these requirements are satisfied by construcing a vault dooras a massive slab formed of layers of various materials resistant todirect attack cutting tools, torches and explosive forces. However, itmust be possible to move such a massive slab door, which may have athickness of up to say 42 easily between open and closed positions. Asimple hinge mounting provides for easy vault door movement. However, inprior door constructions ordinarily it has been impractical, where thickmassive doors have been involved, to use a simple hinge mounting. Theprovision of clearance, as the door swings to and from closed positions,and the requirement of tightly seating the door in the door frame whenclosed, have required complicated massive hinge mechanisms and bearings.

In one known prior vault door construction a simple hinge has been usedfor a massive door, but has required the movement of a door blockingmember perpendicular to the plane of the door when closed, into and outof a blocking position, in order to provide clearance for swinging thedoor between open and closed positions. This prior construction has theadvantage of eliminating boltwork required for all other known priorvault door structures. This prior construction, however, has thedisadvantage that no interengaging means can be provided between thedoor frame and swinging side edge of the door, because any interengagingmeans if present would prevent movement of the described blocking memberperpendicular to the plane of the door to provide the necessary swingingclearance.

On the other hand, for attaining maximum security, directinterengagement should exist between both side edges of the door and theeffective door frame, when the door is in closed and locked position,accompanied by the elimination of bolt-Work at this location. Bolt-workheretofore has provided the overlap to prevent door movement.

Accordingly, it is a general object of the present invention to simplifythe design and construction of massive relatively thick vault doors byeliminating bolt-work and yet achieving maximum security through doorand door frame interengagement at the side edges of a rectangular doorwhen the door is closed and locked.

Likewise, it is an object of the present invention to provide a newvault door construction including simple door hinge means, and improvedmeans without any boltwork for interengagingly holding both side edgesof the door in the door frame when closed and locked.

Furthermore, it is an object of the present invention to provide a newvault door construction of simplified design which is not dependent uponthe hinge structure to maintain the door engaged in the door frame inlocked position once locked, whereby the door remains as an effectivesecurity closure for the vault door opening even though hinge mechanismaccessible at the exterior of the door may be blown off.

Finally, it is an object of the present invention to provide a new vaultdoor construction eliminating the difiiculties heretofore encountered inthe art, satisfying the manifold requirements for achieving maximumsecurity in the construction, operation and use of a vault door,eliminating costly manufacturing and assembly problems heretoforeinvolved, and achieving the stated objects in a simplified andinexpensive manner.

These and other objects and advantages, apparent to those skilled in theart from the following description and claims, may be obtained, thestated results achieved, and the described difiiculties overcome by theapparatus, combinations, parts, elements, subcombinations, arrangementsand constructions which comprise the present invention, the nature ofwhich is set forth in the following general statement, a preferredembodiment of which-illustrative of the best mode in which applicant hascontemplated applying the pr-inciples-is set forth in the followingdescription and shown in the drawings, and which are particularly anddistinctly pointed out and set forth in the appended claims forming parthereof.

The nature of the improved vault door construction of the presentinvention may be stated in general terms as including rectangular doorframe means, a massive relatively thick slab door having a hinged sideedge and a swinging side edge extending between the ends of the door,hinge means mounting the hinged side edge of the door on the door framemeans for hinged door movement into and out of the door frame means forclosing or opening the door, the hinged side edge of the door and theadjacent surface of the door frame means being provided withcomplementary interengaging formations tooth-like in cross-sectionextending to ad between the ends of the door; the door frame means atthe swinging side edge of the door having a fixed frame member, amovable frame member, and a laterally slidable blocking member betweenthe frame members; the swinging side edge of the door and the adjacentsurface of the movable frame member being provided with complementaryinterengaging formations tooth-like in crosssection extending to andbetween the ends of the door; means for moving the blocking member to aposition freeing the movable frame member for movement; and means formoving the movable frame member toward the fixed frame member and awayfrom the swinging side edge of the door when the blocking member ismoved to free position to release the interengagement between themovable frame member and the swinging side edge of the door, whereby thedoor may swing between closed and open positions.

By way of example an embodiment of the improved vault door constructionis shown in the accompanying drawings forming part hereof in which:

FIGURE 1 is a somewhat diagrammatic sectional view through a vault doorand door frame structure incorporating the improvements of theinvention, with the door shown in closed and locked position;

FIG. 2 is a view similar to FIG. 1 with the door in closed position butshowing the interengagement between the movable frame member and thedoor edge released at the swinging side edge of the door; and

FIG. 3 is a View similar to FIG. 2 showing the door swung to openposition.

Similar numerals refer to similar parts throughout the drawings.

The improved vault door construction is indicated generally at 1. It maybe installed in the vault wall 2 to close a vestibule opening generallyindicated at 3 extending through the vault wall 2 from the interior tothe exterior of the vault structure.

The vestibule opening 3 may be formed at the hinged side edge of thedoor by frame members 4, 5, 6 and 7 structurally integrated with thewall 2. The vestibule opening 3 at the swinging side edge of the doormay be formed by fixed frame members 8 and 9, a movable frame member itand a laterally movable blocking member 11 between the frame members 8and 10. The fixed frame members 3 and 9 are structurally integrated withthe vault wall 2.

The vestibule opening 3 at the extremities of the frame members 4, 5, 6,8, l and 11 may be bounded by any usual structural framing elements suchas indicated at 12.

The frame members 4 and have jamb portions 13 and 14 which are angledaway from the center line 15 of the vestibule opening outwardly of thevestibule opening 3. The angled jam-b portions 13 and 14- are formedwith a series of ribs 16 and intervening valleys 17 extendinglongitudinally of the members to the extremities of the membersproviding surfaces which are tooth-like in cross-section.

The door 18 is generally rectangular in shape and may be formed of thedesired thickness to obtain the degree of security required. The door isessentially a solid slab formed of layers of various metals, alloys ormaterials required to resist the various attack measures which might beused directly on the door in an attempt to gain unauthorized access tothe interior of the vault structure. Thus the door slab 18 may be formedof layers of open hearth steel, torch resistant steel, copper, and drillresistant steel. Electrical protection devices 19 may be embedded in thedoorand similarly in the door 4 frame at 24 and 21. The devices 19, Ziland 21 will signal any attempt to penetrate the door or door frame byany attack measures which penetrate such electrical protection zones 15,20 or 21.

The outer portion of the door may be hinged at 22 to the door frame bysimple hinge means. The swinging side edge of the door as well as theextremities of the door (not shown) may be provided with a flange 23overlapping the fixed frame member 8. Thus moistureproof sealing means24 and 25 may be provided between the door 18 and door frame extendingentirely around the door and surrounding the vestibule opening 3.

The door swinging side edge generally indicated at 2s, and the doorhinged side edge generally indicated at 27, each is formed between theextremities of the door with tapered faces, as shown, which taperinwardly of each other toward the interior of the vault structure. Thesefaces 26 and 27 are formed with a series of ribs 23 and interveningvalleys 29 extending longitudinally of the door edges to and between theextremities thereof providing surfaces which are tooth-like incross-section and which are complementary to the ribs 16 and valleys 17formed in the angled jamib portions 13 and i the door frame.

These complementary interengaging angled toothed surfaces of the doorand door frame provide for interengagement therebetween securely holdingthe door engaged in the vestibule opening 3 when the parts are in theposition shown in FIG. 1, throughout the extent of the interengaged doorand frame surfaces at each of the hinged and swinging side edges of thedoor 18.

The movable door frame member 10 is pivoted on pivot pins 3% to the doorframe by spaced lugs or ears 3 projecting laterally from the vestibuleportion 32 :of member 10.. This vestibule portion 32 extends angularlyof the angled jamb portion 14 of member 16 The other face 33 of the jambportion 14 of member if? opposite the toothed formations 16l7 alsoextends at an angle to the center line 15 of the vestibule and isengaged by the wedge surface 34- of blocking member 11 when the blockingmember is in blocking position shown in FIG. 1.

The wedge blocking member 11 has a fiat face 35 parallel with the centerline 15 of the vestibule opening 3 and engaged with a similar fiat face36 of fixed frame member 8 when the blocking member 11 is in blockingposition shown in FIG. 1. The blocking member 11 is slidably mounted onthe fixed member 8 by slide means 37 for movement in the direction ofthe arrow 33 paral lel to the center line 15 of the vestibule opening 3and to the engaged faces 35 and 36.

The blocking member 11 thus functions as a wedge between its angledfaces 34 and 35, and member 11 is preferably provided with a secondarywedge member 39 assembled to the member 11 by shear pins 40 for apurpose to be hereinafter described.

Spaced arms 41 fixed to the secondary wedge member 39 near to theextremities thereof project along the rear of and spaced from theblocking wedge member 11. The arms 4-1 have threaded openings 42 engagedby drive screws 43 mounted on the frame member 9 by hearing blocks 44.Bevel gears 45 keyed to the drive screws 43 are driven by bevel pinions46 on shafts 47 mounted on bearings 48 on frame member 9. Bevel gears 49on the other ends of the shafts 47 are driven by gears 59 oncountershaft 51. Countershaft 51 in turn is driven by another bevel gear52 at the inner end of drive shaft 53 extending through the vault wall 2to the exterior where a handwheel '54 may be provided. Alternately, inplace of the handwheel 54 or auxiliary thereto, a motor, not shown, maybe provided to drive the shaft 53.

The shaft 53 is preferably formed with a reduced shear portion 55between the handwheel 54 and gear 52; and a lock detent, preferably aflange, notched at 55, is mounted on drive shaft 53 between reducedportion- 55 and gear 52 adapted to be engaged by bolt member 57 ofcombination lock 58 when the bolt 57 is in locking position. Thecombination lock 58 is actuated in the usual manner by a spindle 59extending through the frame member '8 to the exterior of the vaultstructure where a typical combination lock dial mechanism '69 may belocated.

The door 18 is preferably provided with an operating handle 61 which, ifdesired, may be controlled by a latch mechanism 62 to hold the doorlatched in locked position until the interengaging means between thedoor and door frame have been released for opening the door. This latchmechanism 62 for the door handle may have any desired construction suchas in the copending Deaton application, Ser. No. 675,298 (Patent No.3,029,753). A finger 63 preferably projects away from the vestibuleopening on each lug 31 of the movable frame member 1t and an adjustablestud 64 is mounted on each finger 63 adapted to be engaged by the rearface 65 of the blocking member 11 as the blocking member is moved in thedirection of the arrow 33.

If desired, a daygate as may be mounted at the inner end of thevestibule opening for temporarily and selectively barr'mg access to thevault interior through the vestibule opening 3 in the usual manner whenthe vault door 13 is in open position.

The operation of the improved vault door construction is as follows.Assume that the parts are in the position shown in FIG. 1. Thecombination lock 53 is unlocked by dialing the combination at the dialmechanism 63, thus retracting the combination lock bolt 57 to theposition shown in full lines in FIG. 2 and releasing its engagement withthe notch 56 on the flange carried by blocking member actuating shaft53. Shaft 53 is now free to turn and may be turned by handwheel 54.Through the gearing 52, 59, 49, 46 and i and shafts 51 and 47, theblocking wedge member drive screws 43 are thus rotated in one direction.Rotation of the screws 43 in the threaded openings 42 of arms 41 movesthe arms 41 in the direction of the arrow 38. This motion is imparted tothe movable blocking member 11 because the arms 41 are fixed to thesecondary wedge member 39 which in turn is pinned at All to blockingmember 11. Blocking member 11 thus moves on its slide means 37 in thedirection of the arrow 38 and continues to move until the rear face 65of the blocking member 11 engages stud 54.

Further movement of the blocking member 11 in the direction of the arrow38 pushes the studs 64 to rotate the movable frame member it) on pivotpins 3b to the position shown in FIG. 2.

When the movable frame member it is in the position shown in FIG. 2, theribs lo and valleys 17 on the jamb portion 14 of member it? are clear ofand spaced from the ribs 28 and valleys 2% of the interengageableformations on the swinging side edge of the door, a suificient distanceso that the door may be swung on its hinge 22 from closed to openposition as indicated by the arcuate dot-dash line 67 in FIG. 2.

In the described open or free position of the movable frame member itafter its movement from engaged position as shown in FIG. 1 toward thefixed door member 8, the vestibule portion 32 of member lti is generallyparallel with door frame member 5 on the opposite side of the vestibuleto present a clear vestibule opening, as shown in FIG. 3.

During movement of the blocking member 11 in the direction of the arrow38, the drive screws 43 are received in apertures 68 formed in theblocking member ii. The studs of course, may be adjusted so that themovable frame member 1d will be in the position shown in FIG. 2 when theblocking member 11 reaches the limit of its movement in the direction ofthe arrow 38. At this time, the narrow edge 69 of blocking memher 11 isfree of movable frame member 10 permitting frame member it to be movedtoward frame member 8 to the position shown in FIG. 2.

The latch mechanism 62, which holds the door or operating handle 61 inthe closed position until the interengaging means between the door anddoor frame have been released may now be operated to unlatched position.The door handle 61 may then be grasped and pulled to swing the door 18from closed position (FIG. 2) to open position (FIG. 3). The interior ofthe vault structure is now accessible through the vestibule opening 3(FIG. 3) by merely opening or closing the dayrgate 66 if a daygate isincluded in the structure.

The door .18 may be closed and locked from open position of FIG. 3, whendesired, by first swinging the door on its hinge 22 from the position ofFIG. 3 to that of PEG. 2. The latch mechanism 62 is then actuated tolatch the door in closed position. Handwheel 54 is then operated toactuate the drive screws 43 in the reverse direction which moves theblocking member 11 in the opposite direction of arrow 33. The corner 70of blockring member 11 during such movement engages the angled wedgeface 33 of frame member 10 to move frame member 19 away from framemember 8 to the position shown in FIG. 1 when the blocking member 11arrives at its limit of movement in a direction opposite to the arrow33, as shown in PEG. 1. At this time the toothlike formations on thejamb members 13 and .14 are engaged with the complementary formations onthe edges of the door, as shown, and the wedge blocking member 11securely blocks the frame member id in the engaged position.

Certain safety devices are incorporated in the structure described. Thereduced shear portion 55 on shaft 53 will fail if rotating force isapplied to shaft 53 at a time when the combination lock 58 is notunlocked.

When the parts are in the position shown in FIG. 1, the secondary wedgemember 39 is held fixed in that position by the arms 41 and the drivescrews 43. The blocking member 11, to which the secondary wedge member39 is connected by shear pins 49, is thus also held fixed. However, ifan explosive force is exerted in some manner in an attempt to gainaccess to the interior of the vault structure, against the end 69 of theblocking member 11, the efiect of which explosive force normally wouldbe to drive blocking member 11 in the direction of arrow 38, the shearpins 40 will fail Upon such failure, movement of member 11 in thedirection of arrow 38 will be resisted by the wedge action of secondarywedge member 39 which, meanwhile, continues to be held fixed. Underthese conditions, the explosive force only results in more securelywedging the blocking member 11 through the secondary wedge member 39between the fixed frame member 8 and the movable frame member 10, thusmaintaining the interengagement between the door and door frame at theside edges of the door through the extent thereof.

In view of the simplicity of the form of the door, the fixed and movableframe members, and the blocking member constructed in accordance withthe present invention, no problems whatsoever are involved in themanufacture of the door of such thickness that is desired for obtainingthe required degree of security. At the same time, a maximum degree ofsecurity is obtained because of the complete interengagement of bothside edges of the door with the door frame throughout the extent of thelongitudinal or longer edges of the door.

Accordingly, the present invention provides a new vault doorconstruction which includes a plain and simple rectangular door per sefree of moving parts having a pleasing appearance; which may be easilymanufactured with the simplest of machining operations; which eliminatesbolt-work; which does not depend upon its hinge mechanism for holdingthe door in locked position when blocked and locked in such position;which may be provided with any desired door thickness to achieve thdegree of security desired; which obtains maximum security againstunauthorized opening or against release of the door by external forcesor conditions through the medium of interengagement between the spaceddoor edges and the door frame members adjacent such edges; whicheliminates difiiculties heretofore encountered in the art and satisfiesthe manifold requirements for achieving security in the construction andoperation of a vault door; and which accomplishes the many new functionshereinabove described and solves problems existing in the art.

In the foregoing description certain terms have been used for brevity,clearness and understanding, but no unnecessary limitations are to beimplied therefrom beyond the requirements of the prior art, because suchterms are utilized for descriptive purposes herein and not for thepurpose of limitation, and are intended to be broadly construed.

Moreover, the description and illustration of the invention is by way ofexample and the invention is not limited to the exact structure shown,because the sizes, shapes and movements of the various parts may bevaried to provide other structural embodiments without departing fromthe fundamental principles of the invention.

Having now described the features, discoveries and principles of theinvention, the operation and use of a preferred form thereof, and theadvantageous, new and useful results obtained thereby; the new anduseful apparatus, combinations, parts, elements, subcombinations,arrangements and constructions, and mechanical equivalents obvious tothose skilled in the art are set forth in the appended claims.

I claim:

1. Vault door construction including rectangular door frame means, amassive rectangular slab door having a hinged side edge and a swingingside edge extending between the ends of the door, hinge means mountingthe hinged side edge of the door on the door frame means for hinged doormovement into and out of the door frame means for closing and openingthe door, the hinged side edge of the door and the adjacent surface ofthe door frame means being provided with complementary interengagingformations extending to and between the ends of the door; the door framemeans at the swinging side edge of the door having a fixed frame member,a movable frame member, and a laterally slidable blocking member betweensaid frame members; the swinging side edge of the door and the adjacentsurface of the movable frame member being provided with complementaryinterengaging formations extending to and between the ends of the door;means for moving the blocking member to a position freeing the movableframe member for movement; and means for moving the movable frame membertoward the fixed frame member and away from the swinging side edge ofthe door when the blocking member is moved to free position to releasethe interengagement between the movable frame member and the swingingside edge of the door, whereby the door may swing between closed andopen positions.

2. The construction defined in claim 1 in which the complementaryint-erengaging formations on the door edges and door frame meanscomprise a series of ribs and intervening grooves providing surfaceswhich are toothlike in cross-section.

3. The construction defined in claim 1 in which the door has an innerface and an outer face, in which the interengaging formations on thedoor frame means at the hinged side edge of the door and on the movableframe member are formed in angular jarnb portions which taper outwardlytoward the exterior of the door frame means, and in which theinterengaging formations on the door side edges are formed in tapereddoor edge faces that taper inwardly toward the inner face of the door.

4.. The construction defined in claim 1 in which the movable framemember has a vestibule portion and a jamb portion angled with respect toeach other, in which the jamb portion has the interengaging formationsformed on the angled face thereof adjacent the swinging side edge of thedoor, in which the jamb portion has an angular wedge face spaced fromthe angular interengagementformed face; and in which the blocking memberhas spaced angular faces tapering toward each other outwardly of thedoor frame means, one of which is slidable on and against the fixed doorframe member and the other of which engages the jamb portion angularwedge face.

5. The construction defined in claim 1 in which the means for moving themovable frame member toward the fixed frame member when the blockingmember is moved to free position includes a member projecting from themovable frame member engaged by the blocking member during movement ofthe blocking member toward free position.

6. The construction defined in claim 5 in which the member projectingfrom the movable frame member and engaged by the blocking member isadjustable.

7. The construction defined in claim 1 in which means is provided formoving the movable fname member from disengaged position to engagedposition when the blocking member is moved from free position to aposition between the fixed and movable frame members, and in which saidmeans includes an angular surface on the movable frame member engaged bythe blocking member during slidable movement of the latter from freeposition.

8. The construction defined in claim 1 in which the door has an innerface and an outer face, in which the fixed frame member has a faceperpendicular to the outer door face, in which the blocking member hasangled wedge faces, in which the blocking member is slidably mounted formovement on the fixed frame member with one angled face of the blockingmember slidably engaged with the fixed frame member face, in which themovable frame member has an angular wedge face, and in which the otherangled face of the blocking member engages the angular wedge face of themovable frame member when the blocking member is in blocking position tohold the interengaging formations on the door and movable frame memberinterengaged.

9. The construction defined in claim 1 in which the blocking member iswedge-shaped in cross-section with its wedge surfaces engaged bycomplementary surfaces of the fixed and movable frame members when theblocking member is in blocking position, in which a secondary wedgemember is provided having shear-pin connection with the blocking member,and in which the secondary wedge member is held fixed when the door isblocked and locked in closed position, whereby upon imparting a movingforce to the blocking member the shear pins will fail and the fixedsecondary wedge member will wedge between the blocking member andmovable frame member to prevent movement of the blocking member therebyholding the door blocked in closed position.

10. Vault door construction including rectangular door frame means, amassive rectangular slab door having a hinged side edge and a swingingside edge extending between the ends of the door, hinge means mountingthe hinged side edge of the door on the door frame means for hinged doormovement into and out of the door frame means for closing and openingthe door, the hinged side edge of the door and the adjacent surface ofthe door frame means being provided with complementary interengagingformations extending to and between the ends of the door; the door framemeans at the swinging side edge of the door having a fixed frame member,a movable frame member, and la laterally slidable blocking memberbetween said frame members; the swinging side edge of the door and theadjacent surface of the movable frame member being provided withcomplementary interengaging formations extending to and between the endsof the door; screw means for moving the blocking member betv een ablocking position and a position freeing the movable frame men oer formovement; means pro jeeting from the movable framemember engaged by theblocking member when the latter is moved toward free position to movethe movable frame member toward the fixed frame member and away from theswinging side edge of the door to release the interengagement betweenthe movable frame member and the swinging side edge of the door; and anangled face on the movable frame member engaged by the blocking memberas the blocking 1% member is moved from free position to blockingposition for moving the movable frame member away from the fixed framemember and toward the swinging side edge of the door to re-engage theinterengagement between the movable frame member and the swinging sideedge of the door.

References fiited in the file of this patent UNITED STATES PATENTS2,860,584 Deaton et al Nov. 18, 1958

1. VAULT DOOR CONSTRUCTION INCLUDING RECTANGULAR DOOR FRAME MEANS, AMASSIVE RECTANGULAR SLAB DOOR HAVING A HINGED SIDE EDGE AND A SWINGINGSIDE EDGE EXTENDING BETWEEN THE ENDS OF THE DOOR, HINGE MEANS MOUNTINGTHE HINGED SIDE EDGE OF THE DOOR ON THE DOOR FRAME MEANS FOR HINGED DOORMOVEMENT INTO AND OUT OF THE DOOR FRAME MEANS FOR CLOSING AND OPENINGTHE DOOR, THE HINGED SIDE EDGE OF THE DOOR AND THE ADJACENT SURFACE OFTHE DOOR FRAME MEANS BEING PROVIDED WITH COMPLEMENTARY INTERENGAGINGFORMATIONS EXTENDING TO AND BETWEEN THE ENDS OF THE DOOR; THE DOOR FRAMEMEANS AT THE SWINGING SIDE EDGE OF THE DOOR HAVING A FIXED FRAME MEMBER,A MOVABLE FRAME MEMBER, AND A LATERALLY SLIDABLE BLOCKING MEMBER BETWEENSAID FRAME MEMBERS; THE SWINGING SIDE EDGE OF THE DOOR AND THE ADJACENTSURFACE OF THE MOVABLE FRAME MEMBER BEING PROVIDED WITH COMPLEMENTARYINTERENGAGING FORMATIONS EXTENDING TO AND BETWEEN THE ENDS OF THE DOOR;MEANS FOR MOVING THE BLOCKING MEMBER TO A POSITION FREEING THE MOVABLEFRAME MEMBER FOR MOVEMENT; AND MEANS FOR MOVING THE MOVABLE FRAME MEMBERTOWARD THE FIXED FRAME MEMBER AND